'Terraform mongodbatlas disk size scale down unexpected

I have backend "remote" configured with provider mongodb/mongodbatlas. Mongodb Atlas cluster configured with auto_scaling_disk_gb_enabled = true. Also during first deploy there was specified disk_size_gb = 15. Since auto scaling is enabled in a while cluster changed size to bigger one 21Gb. Next application of terraform script via app.terraform.io showed plan for this cluster which included disk_size_gb : 21 change to 15. Terraform version used: 1.1.7
Since I'm quite new to terraform it's not clear for me if this is expected behavior to attempt scaling down disk size? I see specifically this step took lots of time (maybe 40 minutes), however completed successfully. Is this possible to not perform scaling down disk size and leave there disk_size_gb specified?



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